Lubricating apparatus



May 25, 1937. F. s. BARKS ET AL LUBRICATING APPARATUS 2 Sheets-Sheet lFiled May 22, 1956 was!!! l 0 1 1 |,!U,v/vf/V UN 2, m e f 9 v .":Mvl LN2 G 247 Z H a, w S w 0 M w 6 6 V, A w

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y 8 4 Jl Patented May 25, 1937 LUBRICATING APPARATUS Frank S. Barks andVictor G. Klein, St. Louis,

Mo., assignors to Lincoln Engineering Company, St. Louis, Mo., a'corporation of Missouri Application May 22, 1936, Serial No. 81,254 16claims.i (c1. azi-47.3)

This invention relates to lubricating apparatus, and with regard tocertain more specic features, to an improvement upon the semi-automatic,portable, hand-injector pump, disclosed in the United States patent ofLutwin C'. Rotter et al., No. 2,038,761, led April 3, 1935, dated April2S, 1936 for lubricating apparatus.

Among the several objects of the invention ,may be noted the provisionof the improvement over the construction of said patent applicationcomprising the provision .of a separate, one-stroke power head which isvery quickly and simply attachable to any of a group of tube assemblies,each containing a diiferent lubricant; ythe provision of apparatus ofthe class described which will permit of very convenient re-lling ofeach of the said lubricant tube assemblies; and the provision ofapparatus of this class which is simple and compact in :constructionvand quite easily operated. Other objects will be in part obvious and inpart pointed out hereinafter.

The invention accordingly comprises the elements and combinations ofelements, features .of construction, and arrangements of parts whichwill be exemplified in the structures hereinafter described, and thescope of the application of which will be indicated in the followingclaims.

In the accompanying drawings, in which is illustrated one of variouspossible embodiments of the invention,

Fig. 1 is a longitudinal section embodying the invention, certain valveparts having been eliminated for clarity;

Fig. 2 is an enlarged cross section taken on line 2 2 of Fig. 1 butshowing said Valve parts;

Fig. 3 is a cross section taken on line 3--3 of Fig. 2;

Fig. 4 is a fragmentary cross section taken on line 4-4 of Fig. 2;

Fig. 5 is a fragmentary cross section taken on line 5--5 of Fig. 2;

Fig. 6 is a longitudinal section of a lubricant tube with power head andoutlet head removed and shown in lling position;

Fig. 7 is `a .side elevation of the power head which has been removedfrom the structure of Fig. 6;

Fig. 8 is a side elevation, parts being broken' away, of the outlet headwhich has been removed from the tube of Fig. 6; and,

Fig. 9 is a view similar to Fig. 6 but showing a succeeding position ofparts and said head of Fig. 8 applied preparatory to applying the powerhead of Fig. 7. Similar reference characters indicate correspendingparts Y.throu'ghoutthe several views of the drawings. v

Referring now Vmore particularly to Fig. 1, there is shown at numeral la cylinder to which is removably threaded an outlet head `3, sealed atwasher 2D, the head ki carrying a curved, removable outlet pipe 5 at theend of which is a nozzle t6.' The pipe 5 is one of a set of similar onesthat may be used. Each `has a different curvature for reaching lubricantinlets in various locations. The nozzle I6 is also arranged to beremovable .to have other nozzles applied. The type of nozzle to be used.depends upon the type of lubricant in the cylinder 1, and'upon the typeof receiving opening for accommodating the nozzle.

The head A3 has therein an outlet check valve 'I and is internallyprovided with a pump cylinder 9 adapted to slidably receive a pumpplunger II. The forward end of the plunger Il is conic as indicated atnumeral i3 and the rearward end of the cylinder 9 is :beveled as shownat numeral I5 to more readily effect entry of the plunger into thevcylinderon a forward stroke. The head 3 also A-carriesan inlet.connection II for theinilling vof lubricant where the operator hasavailable a pressure iilling device.

The plunger ll is threaded into the hexagonal shoulder vI2 of a rod 2l,a suitable cross passageA 23 for a wrench or the like being provided forthis purpose. A floating follower piston 25 is pro- Videdwith suitablesealing means 21 operative both in connection with the wall of thecylinder l and with said .rod 2 I.

(Fig. 1) into two compartments, namely, a forwardly located lubricantcompartment (to the left of the piston) and a rearwardly located aircompartment (to the right of the piston).

'Screw-threaded permanently and sealed to the rearward end of thecylinder I 4is a diaphragm member`2 in which are air-transmittingopenings 4. The diaphragm member 2 is internally threaded to removablyreceive by threading an adapter tube "6 which seats and seals at its-bottom upon a gasket 8 held in a groove Within the diaphragm member 2.At its other end the adapter cylinder 6 is permanently screw-threadedThe purpose of the piston 25 is to divide the cylinder I into and sealedwith 'a head 29 having a closing diaphragm 3l therein. It will beapparent that -the diaphragm 3| and the diaphragm 2 differ in that theformer is without air-transmitting op'en ings, whereas the latter hassuch. l Y

Reference to Figs. E6 and '7 will show that the adapter sleeve -6 andthe head 29 with attached parts form a permanent power unit which isattachable to and detachable from the diaphragm member 2. A purpose ofthe diaphragm member 2 is to provide a rearward slide bearing for therod 2| and to support the air motor unit of Fig. 7 in proper concentricposition.

On the left (inner) side of the diaphragm 3| is threaded a differentialcylinder 33 which extends coaxially with, and` into the cylinder 6. Therear end of the rod 2|, outside of the diaphragm 2, carries abutton-like piston head I9 which contacts a differential piston 35operating in cylinder 33. The head I9 slidablylcooperates with theinterior of cylinder 33, and although not packed, it forms a fairpiston-like seal in the cylinder. It should be noted Vcarefully rthatthe head I0 only abuts and is easily separable from the piston 35, asindicated by the separatiorof.

parts illustrated by Figs. 6 and 1. The purpose of this is to permit therod 2| to be actuated by said piston I0 under assembled condition, butto permit of ready disassembly and to permit the operator to use thebutton i9 as means for effecting manual filling operations to bedescribed under separated conditions rof the power head. The bevelledlower end of cylinder 33 further facilitates the easy assembly.k

The differential piston 35 is provided with a rigid, hollow extension 31which passes through the diaphragm 3|, being packed therein by means ofa packing 39. 'Ihe extending stem 31 carries a power piston 4| upon theright-hand side of the diaphragm 3|, said piston 4| operating in aclosed cylinder cap 43 screwed permanently to said head 29.

As shown in Figs. 2 and 3, the head 29 is provided-with an air inlettting 41 adapted to receive an air chuck of an air line under pressure.The tting 41 screws into a recess 49 in which is a valve 5|. The recessand the valve may transmit air about the Valve (see Fig. 4), due tosquare, relieved portions 52. Thus air may pass from the fitting 41 andaround the valve 5| when the valve is removed trom its seat 53. However,the valve is normally pressed to its seat to close Off the air by meansof a spring 55 and the pressure of the air itself. Y

The valve 5| has a stem 51 which passes with clearance through a passage59 and to the stem Bl of arsecond valve 33. The body of the valve 63snugly but slidably ts the hole in which it works, so that no passage toatmosphere is provided around the valve. However, a passage 54 toatmosphere is provided in the head 29.

A handle 55 pivoted to the head 29 cooperates With the outer end G1 ofthe Valve 63 so that upon pressing the handle 35, said valve 63 may beseated against its seat 45 and the valve,5| unseated from its seat 53,both against the pressure of spring 55 and the air line pressure.

Thus, when the valve 5| is unseated, air may ow in from the fitting 41intothe passage 59. A side passage 1| (Fig. l) communicates with passage59 and passes into communication with said differential cylinder 33.

Beyond the seat 45 there is also a passage 13 communicating from saidpassage 59 and to the region beneath piston 4| in the cylinder 43 (Fig.3). Passage 19 leads from a point ahead of seat 53 to the cylinder .6.

Assuming some lubricant to; be in the cylinder I ahead of piston 25, theoperation is as follows:

By means of an air chuck, an air hose is placed in connection with theair receiving `fitting 41.

`Priming air immediately flows through the cylinder 6, holes 4 indiaphragm 2, and to the cylinder to force the follower 25 against thelubricant ahead of it. The plunger will then be back and out of cylinder9, because air under pressure in cylinder 3, in attempting to flow intothe cylinder 33, forces back the button piston I0 against thediierential piston 35. The button piston I0 has a separable sealingcontact with the packing 36 of the piston 35, as shown. After Contact isinitiated, it is maintained, because, as will be shown, the hollowportion 39 beneath the piston I9 is in communication with the exhaust bymeans of a passage 49. This is because the button piston i9 has asliding fit in the cylinder 33. Hence open cylinder 9 is primed bygrease under air pressure. 'I'he air, normally pressing upon the valve5i holds it to its seat 53 to check any flow past the same.

Next, the nozzle valve Hi is placed in communication with the openingwhich it is desire-d to have receive the lubricant. When the lever 35 ispressed, the exhaust Valve 53 is seated, the inlet valve 5| is openedand air is admitted to the passage 59, but notto thepassage 13. Henceair under pressure passes through the sideward passage 1| (Fig. l) tothe cylinder 33 to impress its force upon the top of differential piston35 te produce a balanced pressure condition and hence canceling thereturn action of air beneath the button piston I0.

Some of the charge of air which enters the cylinder 33 passes throughthe hollow stem 31, via the port 11 and out into the, cylinder 43, whereit impresses its force upon the top of power piston 4| to force down therod 31 and piston 35 against. the piston I9. This forces rod 2| to pushplunger into the cylinder 9 to eiiect a single discharge of lubricanttherefrom. In the meantime air exhausts from beneath the piston 4| viapassage 54. Fig. l illustrates the discharging position of parts. Theair pressure in cylinder 33 and the air pressure in/ cylinder 3 beingequal, the air pressure on opposite sides of the combined pistons I9 and35 is equalized, thus leaving the full pressure on piston 4| without anyback pressure to resist it in forcing the rod 2| through a dischargingstroke.

Upon releasing the handle 65, the flow of air to the passage 59 is cutoff by valve 5|, and thus flow is cut oi to the top of the power piston4|. At the same time the valve 93 is opened so that the air in cylinder43 above piston 4i may exhaust to cylinder 33 through stem 3'. and theair from cylinder 33 exhausts via port 1 passage 59,

the pressure in the hollow pcrtion 33 between pistons lil and 35 isexhausted through ports 49,

leakage whatsoever to the cylinder 33 from the cylinder 6. Thus anothercharge of lubricant is drawn or forced into said cylinder 9.

In View of the fact that pressure of air isy maintained behind thefollower piston 25 and in the cylinder because of passage 19 leadingfrom a point ahead of the valve 5I in communication with the inletfitting 41, every time that an air line is attached to the fitting 41,priming air is immediately forced into the cylinder I behind thefollower 25 and said pressure is released as soon as the air line isremoved. Thus no reliance is placed upon holding an isolated charge ofair in the cylinder I. Each time that a connection is made, the deviceis primed and made ready for a power stroke.

has been released that the pistons 4I and 35 will be always in returnposition (see dotted lines, Fig. '7) when the power unit isre-applied.Also, since the air hose is disconnected from fitting I1 prior tounscrewing the power unit, there will be zero pressure in the cylinders6 and I upon their separation and after the power unit parts are intheir Fig. '1 dotted-line positions.

Since the above is true, the piston I0 will be seen to have always beenpushed part way out upon separation, whereby it is in a position tobeeasily grasped for relling.

One of the advantages of the invention is that a lubricant servicestation may carry various a.,- semblies of lubricant-containingcylinders I, with lubricants of different kinds respectively therein,such as, for instance, water-pump lubricant, universal joint lubricant,chassis lubricant, and the like. For all of these, only one one-strokeair motor or power unit, such as shown in Fig. '1, needs to be carried,because said unit may be screwed into the diaphragm member 2 of anylubricant-carrying assembly. For instance, an operator may screw thepower unit to a cylinder I carrying water pump lubricant and lubricate awater pump. Then, he may unscrew the power unit from saidwater-pump-lubricant-containing cylinder and apply it to a cylinder Icontaining, say universal joint lubricant, and proceed to lubricate sucha joint. Thus a variety of supplies of lubricants are ready, and theuser need purchase only one of the power units. In this respect, thepresent invention is an improvement upon the one described in saidapplication. Furthermore, it is advantageous in comparison with othersingle power unit and multi-cylinder devices in that the power unit isof the single-shot variety which gives economy in dispensing and theconnection is easier, simpler and more sure by reason of the mereabutment between members II! and 35 which are pneumatically heldtogether.

Furthermore, the movement of assembling the power unit with thereservoir is all that is required to abut the pistons I0 and 35 forsubsequent automatic operation.

One mode of filling the device is to connect a lubricant filler line tothe inlet I1 and vforce lubricant therethrough against piston 25 whichis thus automatically forced back. At this time there is no air lineconnected to the fitting 41 so that the air pressure behind the followerpiston 25 is atmospheric and as the follower proceeds inwardly, the airis exhausted through port 19 and open fitting 41. The diaphragm 2functions as a stop to automatically limit the travel of a followerpiston 25 and consequently the charge of the lubricant.

Sometimes the user is not equipped with lling apparatus of the classabove referred to. In this event he unscrews the power component shownin Fig. 7. The member 2 remains on the cylinder or barrel I. He alsounscrews the outlet head 3 from said cylinder I. He then grasps theexposed button piston I!! and withback the latter.

It will be seen that since the power unit is uncoupled only after thelever f draws the rod 2I, thereby causing the shoulder I2 on said rod tocontact the piston 25 to pull Then if the lower end of` the Y.

cylinder I is in a lubricant supply .I4 such as.v

shown in Fig. 6, the suction will draw in a charger of lubricant. Afiller plate or apaddle mayalso be used as known.r After the charge iscomplete the head 3 is applied as sho-wn in Fig. 9. The

rod 2| may then be pushed back into its position Y within the cylinder Iand the piston .25 will re-r tain its position at the upper end of thecylinder I. This is because the lubricant in' the cylinder blocksmovement of the piston 25 with the head 3 in position. `Thereafter theassembly of cylinder I, outlet head 3 and diaphragm 2 is ready for useby applying a power unit. A group of these each having a differentlubricant therein, may be kept in readiness, say in a rack.

The threaded connection between the cylinders 6, 33, I3and the member 29is a permanentp'ne;

whereas the connection between said cylinder 5 and the diaphragm member2 is a quick-detachable connection. The threads between the cylinder 6and the diaphragm memberY 2 are relatively coarse and of a nature `to beeasily started.. The

pattern on the member 29 is such that slippageH of the hand is preventedin rotating the motor unit, and the diaphragm member 2 is externallyknurled. Usually the operator grips the knurled diaphragm member 2 withhis left lhand and screws in the motor unit with the right hand.

In view of the above, it will be seen that the several objects of theinvention are achieved and 1 l. In apparatus of the class described,va-fluid y reservoir, a reciprocating pump at one end` of said reservoiradapted to withdraw lubricant;

from the reservoir and eject it, supporting means on the other end ofthe reservoir, an operating means passing from said pump through thereservoir and slidably through said supporting means, a followerdividing said reservoir into a lubricant compartment and an aircompartment and surrounding said operating means, a control member onsaid operating means outside of said supporting means, an air powerunit, quick-detachable means between said power unit and said supportingmeans, a movable part on said power unit adapted upon one stroke merelyto abut said control member to move the operating means to ejectlubricant, and means whereby said power unit applies air to the controlmember to effect reversal of movement of said control member to primethe pump and return the power unit to starting position.

2. In apparatus of the class described, a fluid reservoir, areciprocating pump adapted to withdraw lubricant from the reservoir andeject it, an operating member passing from said pump and from thereservoir, a control member on said operating member located exteriorlyof the reservoir, and a quick-detachable air power unit adapted to befastened to said reservoir and having a part adapted merely to abut saidcontrol member to operate the pump to eject, and to apply air to saidcontrol member to operate the force back the abutting part on the powerunit.

3. In apparatus of the class described, a fluid reservoir, areciprocating pump adapted to Withdraw lubricant from the reservoir andeject it, an operating member passing from said pump and from thereservoir, a control member on said operating member located exteriorlyof the reservoir, a follower in the reservoir movable by said operatingmember to draw in fluid, said control member being manually operablekfrom the outside of the reservoir, a power unit, a quick-de,- tachableconnection between` the power unit and the reservoir, a pressure memberin the power unit, said pressure member in the power unit being adaptedto force said operating member on one stroke of the power unit, and saidpower unit having means to cause said operating member to force thedriving means to starting position on the next stroke.

4. In apparatus of the class described, a uid reservoir, a reciprocatingpump adapted to withdraw lubricant from the reservoir and eject it, anoperating means passing from said pump through the reservoir and to apoint outside thereof, a control member on said operating means outsideof the reservoir and a quick-detachable power unit for the reservoir,means in the power unit adapted when attached to abut said controlmember to actuate the pump upon one power stro-ke, and means in thepower unit adapted to empower the control member to force the parts inthe power unit back to starting position.

5. In apparatus of the class described, a iiuid reservoir, areciprocating pump adapted to withdraw lubricant from the reservoir andeject it, an operating member passing from said pump and from thereservoir, a control member on said operating means exteriorly of thereservoir, and a quick-detachable single-stroking pneumatic power unitadapted to be fastened to said reservoir and by its movement ofattachment to abut with said control member, means whereby the pump isoperated through said abutment by operation of the power unit, and meansin said power unit energizing the control member to set the power unitto starting position.

6. In apparatus of the class described, a fluid reservoir, areciprocating pump at one end of said reservoir adapted to withdrawlubricant from the reservoir and eject it, air-transmitting supportingmeans on the other end of the reservoir, an operating member passingfrom said pump through the reservoir and slidably through saidsupporting means, a follower dividing said reservoir into a lubricantcompartment and an air compartment and surrounding said operating means,a control member on said operating means outside of said supportingmeans, an air motor, quick-detachable means between said air motor andsaid supporting means, the quick-detachable connection comprising anair-tight cylinder, an inside cylinder therein, a piston in said insidecylinder adapted to receive pressure to force said piston against saidcontrol member, said control member slidably itting said insidecylinder, whereby air in said air-tight cylinder will force the controlmember to cause said pump to eiect a suction stroke and force said motorto a starting position, said air also passing through said airtransmitting support to said air compartment.

'7. In apparatus of the class described, a iiuid reservoir, areciprocating pump at one end of said reservoir adapted to withdrawlubricant from the reservoir and eject it, air-transmitting sup-`porting means on the other end of the reservoir, an operating memberpassing from said pump through the reservoir and slidably through saidsupporting means, and a follower dividing said reservoir into alubricant compartment and an air compartment and surrounding saidoperating means, a control member on said operating means outside ofsaid reservoir, an air motor, quick-detachable means between said airmotor and said supporting means, a cylinderon the motor, a piston insaid cylinder adapted to'receive pressure to force said piston againstsaid control member, said control member slidabiy fitting said cylinder,and means for actuating the air engine to move the control member in onedirection and to apply air to the control member to move the engine in areverse direction, said control member being separable from the airmotor upon removal ofthe latter.

8. In apparatus of the class described, a fluid reservoir, areciprocating pump adapted to withdraw lubricant from the reservoir andeject it upon suction and compression strokes respectively, an air motorhaving a quick-detachable connection with the reservoir for applyingsuperatmospheric priming pressure inside of the reservoir and to thelubricant,'a power means in said air motor, a differential cylindertherein, a control piston in said diiierential cylinder reciprocatingwith the pump, a dilerential piston in said differential cylinder andreciprocating with the power means, said control piston cooperating withsaid differential piston means for introducing air pressure on the powermeans in a direction to drive the pump to an ejecting stroke and at thesame time to the differential piston to balance pressure thereon fromsaid control piston.

9. In apparatus of the class described, a'

fluid reservoir, a reciprocating pump adapted to withdraw lubricant fromthe reservoir and eject it upon suction and compression strokesrespectively, and air motor having a quick-detachable connection withthe reservoir for applying superatmospheric priming pressure inside ofthe reservoir and to the lubricant, a power means in said air motor, adifferential cylinder therein, a control piston in said diierentialcylinder reciprocating with the pump, a differential piston in saiddifferential cylinder and reciprocating with Ythe power means, saidcontrol piston cooperating with said differential piston means` forintroducing air pressure on the power means in a direction to drive thepump to an ejecting stroke and at the same time to the differentialpiston to balance pressure thereon from said con-v trol piston, andsubsequently to exhaust the said introduced air and to introduce air toprime the reservoir and to press the control piston toward saiddifferential piston to return the motor.

10. In apparatus of the class described, a pump, a lubricant supplychamber, a follower in said chamber, a separate air motor for operatingsaid pump, a quick-detachable connection between said air motor and saidsupply chamber, a differential cylinder associated with said air motor,control means extending from the pump and adapted to t into saiddifferential cylinder when the air motor is applied to the chamber, adifferential piston carried by the air motor and in said differentialcylinder and abutting said control means, and valved means on the motoradapted in one position of parts to direct air behind said follower andagainst said control means while effecting exhaust from the diierentialpiston, and in another position to direct air against the saiddifferential piston and to the air motor to energize the abuttingcontrol means to operate the pump.

11. In apparatus of the class described, a pump, a lubricant supplychamber, a follower in said chamber, an extension from said pump passingthrough said follower, a piston head on said extension adapted to bereached to effect indrawing of the follower by pulling out theextension, an air motor, a quick-detachable connection between said airmotor and said chamber, a differential cylinder associated with said airmotor and slidably accommodating said piston head, a differential pistonin said differential cylinder abutting said piston head, and valve meansadapted in one position to direct air behind said follower and againstsaid piston head to effect a suction stroke of the pumping means andpriming thereof, and in another position thereof to direct air to effecta pumping stroke of the pump and at the same time to direct air abovesaid differential piston to balance the pressure from the abuttingpiston head.

12. In apparatus of the class described, a lubricant supply compartment,a reciprocating pump adapted to withdraw and eject lubricant from saidcompartment, a follower in said compartment forming a lubricant chamberon the side nearest the pump and providing an air chamber on the otherside, an extension movable with said pump, a control member carried bysaid extension, the arrangement between the follower and said controlmember being such that as the pump is driven by the control memberthrough said extension to draw in a char-ge, said follower is driven toforce the charge to the pump, an air engine, a quickdetachableconnection between said air engine and said compartment, a differentialcylinder on said engine, a surrounding air-tight cylinder for deliveringair under pressure to said air chamber, a power piston, a differentialpiston in said diierential cylinder, and means joining said power pistonand differential piston, said control member and differential pistonmerely abutting when the engine is assembled to the chamber, and valvemeans for introducing air to said differential piston and forintroducing air to such side of the power piston as will force the pumpto execute an ejecting stroke.

13. In apparatus of the class described, a lubricant supply compartment,a reciprocating pump adapted to withdraw and eject lubricant from saidcompartment, a follower in said compartment forming a lubricant chamberon the side nearest the pump and providing an air chamber on the otherside, an extension movable with said pump, a control member carried bysaid extension, the arrangement between the follower and said controlmember being such that as the pump is driven by the control memberthrough said extension to draw in a charge, said follower is driven toforce the charge to the pump, an air engine, a quick-detachableconnection between said air engine and said compartment, a differentialcylinder on said engine, a surrounding airtight cylinder for deliveringair under pressure to said air chamber, a power piston, a differentialpiston in said differential cylinder, and means joining said powerpiston and differential piston, said control member and differentialpiston merely abutting when the engine is assembled to the chamber, andValve means'for introducing air to said differential piston and forintroducing air to such side of the power piston as will force the pumpto execute an ejecting stroke and alternatively for introducing airagainst the control member to effect a pump suction stroke and alsoagainst the follower.

i4. In apparatus of the class described,'a reservoir, a pump, operatingmeans for said pump extending from said reservoir, a priming means forthe pump cooperating with said operating means for iniilling of fluid,manual control means on the operating means exteriorly of the reservoiradapted to be manipuated to cause the oper-v ating means to move thepriming means to effect an iniilling of the reservoir, and a power unithaving a quick-detachable connection with said reservoir and adaptedupon a manipulation to mo-ve said manual control means to effect asingle ejection of lubricant and by another manipulation to power saidcontrol means to force the power unit and the pump to starting position.

15. In apparatus of the class described, a fluid reservoir, areciprocating pump adapted tol withdraw lubricant from the reservoir andeject it, an operating member passing from said pump and from thereservoir, a control member on said operating member located exteriorlyof the reservoir, and a quick-detachable air power unit adapted to befastened tosaid reservoir, a part of the power unit abutting saidcontrol member whereby the control member may be forced to opera-te thepump to eject, and means in the power unit to apply air to said controlmember to operate the pump to return from ejection position and tc forceback the abutting part on the power unit, said control member and saidabutting part on the power unit having a pneumatic seaing connection atthe abutment therebetween.

16. In apparatus of the class described, lubricant pumping means adaptedto be primed with lubricant under pressure obtained from air undersuperatmospheric pressure, a member extending from the pumping meansadapted to be controlled to effect pumping, a quick-detachable air motorfor said lubricant pumping means, a driving piston in said motor, adriven piston, a cylinder surrounding said driven piston and slidablyaccommodating said controlled member, said controlled member and drivenpiston having a sealing abutment in the cylinder, and means forbalancing super-atmospheric pressure on opposite sides of the sealeddriven piston and controlled member while said pressure is applied tothe lubricant pumping means for priming purposes and to the power pistonfor driving purposes, and means for exhausting pressure from the powerpiston and from one side of the organization of sealed driven piston andcontrolled member, whereby said priming air effects a return action cnthe air motor by driving said sealed differential piston and controlledmember.

FRANK Sl. BARKS.

VICTOR G. KLEIN.

